第1个上传组件commons-fileupload =============commons-fileupload ================
common-fileupload组件是apache的一个开源项目之一,可以从http://jakarta./commons/fileupload/下载。该组件简单易用,可实现一次上传一个或多个文件,并可限制文件大小。 -下载后解压zip包,将commons-fileupload-1.1.1.jar,和commons-io-1.2.jar(这里我们用的是更新的版本,但是用法是一样的)复制到tomcat的webapps\你的webapp\WEB-INF\lib\下,如果目录不存在请自建目录。 新建一个servlet: FileUpload.java用于文件上传: package com.drp.util.servlet;
import java.io.IOException; import java.io.PrintWriter;
import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.*; import java.util.*; import java.util.regex.*; import java.io.*; import org.apache.commons.fileupload.servlet.*; import org.apache.commons.fileupload.disk.DiskFileItemFactory;
public class FileUpload extends HttpServlet {
private String uploadPath = ""; // 用于存放上传文件的目录
private File tempPath = new File("D:\\Tomcat 5.5\\webapps\\drp1.2\\tempimages\\"); // 用于存放临时文件的目录
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { res.setContentType("text/html; charset=GB18030"); PrintWriter out = res.getWriter(); System.out.println(req.getContentLength()); System.out.println(req.getContentType()); DiskFileItemFactory factory = new DiskFileItemFactory(); // maximum size that will be stored in memory //允许设置内存中存储数据的门限,单位:字节 factory.setSizeThreshold(4096); // the location for saving data that is larger than getSizeThreshold() //如果文件大小大于SizeThreshold,则保存到临时目录 factory.setRepository(new File("D:\\Tomcat 5.5\\webapps\\drp1.2\\tempimages"));
ServletFileUpload upload = new ServletFileUpload(factory); // maximum size before a FileUploadException will be thrown //最大上传文件,单位:字节 upload.setSizeMax(1000000); try { List fileItems = upload.parseRequest(req); // assume we know there are two files. The first file is a small // text file, the second is unknown and is written to a file on // the server Iterator iter = fileItems.iterator();
// 正则匹配,过滤路径取文件名 String regExp = ".+\\\\(.+)$";
// 过滤掉的文件类型 String[] errorType = { ".exe", ".com", ".cgi", ".asp" }; Pattern p = Pattern.compile(regExp); String itemNo = "";//文件存放路径 while (iter.hasNext()) { FileItem item = (FileItem) iter.next();
// 忽略其他不是文件域的所有表单信息 if (!item.isFormField()) { String name = item.getName(); long size = item.getSize(); if ((name == null || name.equals("")) && size == 0) continue; Matcher m = p.matcher(name); boolean result = m.find(); if (result) { for (int temp = 0; temp < errorType.length; temp++) { if (m.group(1).endsWith(errorType[temp])) { throw new IOException(name + ": wrong type"); } } try {
// 保存上传的文件到指定的目录
// 在下文中上传文件至数据库时,将对这里改写 item.write(new File("d:\\" + m.group(1)));
out.print(name+" "+size+"<br>");
} catch (Exception e) { out.println(e); }
} else { throw new IOException("fail to upload"); } } } } catch (IOException e) { out.println(e); } catch (FileUploadException e) { out.println(e); } }
public void init() throws ServletException { this.uploadPath = this.getServletConfig().getInitParameter("upload_path");//的到web.xml中的配置文件用于保存上传文件,也可以在已开始定义的时候初始化,不过这样可以通过改动配置文件来改动存放路径,不用该代码,增加了灵活性。 } }
web.xml中相应的配置如下: <servlet>
<servlet-name>FileUpload</servlet-name> <servlet-class>com.drp.util.servlet.FileUpload</servlet-class>//注意路径
<init-param> <param-name>upload_path</param-name> <param-value>D:\\Tomcat 5.5\\webapps\\drp1.2\\images\\item\\</param-value>//存放地址 </init-param> </servlet>
<servlet-mapping>
<servlet-name>FileUpload</servlet-name> <url-pattern>/servlet/FileUpload</url-pattern>
</servlet-mapping>
对应的请求文件:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>index.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body> //注意action地址,还有enctype要写成multipart/form-data,和method="POST" <form name="uploadform" method="POST" action="./servlet/FileUpload" ENCTYPE="multipart/form-data">
<table border="1" width="450" cellpadding="4" cellspacing="2" bordercolor="#9BD7FF">
<tr><td width="100%" colspan="2">
文件1:<input name="x" size="40" type="file">
</td></tr>
<tr><td width="100%" colspan="2">
文件2:<input name="y" size="40" type="file">
</td></tr>
<tr><td width="100%" colspan="2">
文件3:<input name="z" size="40" type="file">
</td></tr>
</table>
<br/><br/>
<table>
<tr><td align="center"><input name="upload" type="submit" value="开始上传"/></td></tr>
</table>
</form>
</body> </html>
|